public interface ChatInterface
	{
		/**
		 * Called by the GUI when it is constructed.
		 */
		public void setGUI(ChatGUI gui);
		
		/**
		 * Connect to a chat server.
		 * Both host and port may be invalid.
		 * @param host - the host name the user inputs
		 * @param port - the port the user inputs
		 * @param nickname - the name to use when connecting to the server
		 */
		public void connectChatServer(String host, String port, String nickname);

		/**
		 * Disconenct from the current chat server.
		 * If this method is called without being connected to any 
		 * chat server nothing happens.
		 */
		public void disconnectChatServer();
		
		/**
		 * Send a text message to the chat server
		 */
		public void send(String text);
	}
